From: Stanislav Fomichev <sdf@fomichev.me>
To: YueHaibing <yuehaibing@huawei.com>
Cc: davem@davemloft.net, sdf@google.com, jianbol@mellanox.com,
jiri@mellanox.com, mirq-linux@rere.qmqm.pl, willemb@google.com,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: [PATCH] flow_dissector: Fix vlan header offset in __skb_flow_dissect
Date: Wed, 19 Jun 2019 11:39:38 -0700 [thread overview]
Message-ID: <20190619183938.GA19111@mini-arch> (raw)
In-Reply-To: <20190619160132.38416-1-yuehaibing@huawei.com>
On 06/20, YueHaibing wrote:
> We build vlan on top of bonding interface, which vlan offload
> is off, bond mode is 802.3ad (LACP) and xmit_hash_policy is
> BOND_XMIT_POLICY_ENCAP34.
>
> __skb_flow_dissect() fails to get information from protocol headers
> encapsulated within vlan, because 'nhoff' is points to IP header,
> so bond hashing is based on layer 2 info, which fails to distribute
> packets across slaves.
>
> Fixes: d5709f7ab776 ("flow_dissector: For stripped vlan, get vlan info from skb->vlan_tci")
> Signed-off-by: YueHaibing <yuehaibing@huawei.com>
> ---
> net/core/flow_dissector.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
> index 415b95f..2a52abb 100644
> --- a/net/core/flow_dissector.c
> +++ b/net/core/flow_dissector.c
> @@ -785,6 +785,9 @@ bool __skb_flow_dissect(const struct sk_buff *skb,
> skb && skb_vlan_tag_present(skb)) {
> proto = skb->protocol;
> } else {
> + if (dissector_vlan == FLOW_DISSECTOR_KEY_MAX)
> + nhoff -= sizeof(*vlan);
> +
Should we instead fix the place where the skb is allocated to properly
pull vlan (skb_vlan_untag)? I'm not sure this particular place is
supposed to work with an skb. Having an skb with nhoff pointing to
IP header but missing skb_vlan_tag_present() when with
proto==ETH_P_8021xx seems weird.
> vlan = __skb_header_pointer(skb, nhoff, sizeof(_vlan),
> data, hlen, &_vlan);
> if (!vlan) {
> --
> 2.7.0
>
>
next prev parent reply other threads:[~2019-06-19 18:39 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-19 16:01 [PATCH] flow_dissector: Fix vlan header offset in __skb_flow_dissect YueHaibing
2019-06-19 18:39 ` Stanislav Fomichev [this message]
2019-06-20 7:20 ` Jiri Pirko
2019-06-20 10:02 ` Yuehaibing
2019-06-21 0:33 ` Stanislav Fomichev
2019-06-24 13:50 ` Jiri Pirko
2019-06-26 8:08 ` [PATCH] bonding: Always enable vlan tx offload YueHaibing
2019-06-26 15:25 ` Jiri Pirko
2019-06-26 15:29 ` Yuehaibing
2019-06-26 16:13 ` mirq-linux
2019-06-26 16:48 ` Jiri Pirko
2019-06-26 23:29 ` Michał Mirosław
2019-06-26 16:03 ` [PATCH] team: " YueHaibing
2019-06-26 17:14 ` David Miller
2019-06-22 23:19 ` [PATCH] flow_dissector: Fix vlan header offset in __skb_flow_dissect David Miller
2019-06-24 3:49 ` [PATCH v2] " YueHaibing
2019-06-27 2:28 ` David Miller
2019-06-27 7:44 ` Jiri Pirko
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